“In 2011, Cai took his two sons to his workplace , a factory in Fuming, where he worked as a stone stone caster, and found a school for them. Ever since, the father and his two sons have been living in a hut owned by the factory, with only one bed.We began filming their life on February 2nd 2014. On the morning of 6th, we received threats from the boss and had to stop filming.” — Wang Bing.